my email app will not stay open, keeps quitting

Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?

Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.

If still no good Disconnect from the Internet, then start Mail, look for the last rec'd eMail.

Quit Mail & login to your WebMail in a Browser, if possible delete any later eMails there after the last rec'd one on the Mac.

Hello

have tried your suggestions email will open in safe mode with no emails displayed but as soon as try anything it quits

Disconnected from internet same problem

Cleared emails via iPhone still the same rebooted several times still the same mail quits unexpectedly

Any help please

Any luck my friend?